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W. J. FERGUSON.

DEVICE FOR OPENING OR CLOSING ELEVATOR DOORS.

No. 527,366. Patented Oct. 9,1894.

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THE Nonms PEYERs co. Pnorauma. WASHINGTON, u c,

UNITED STATES PATENT OFFICE.

WILLIAM J. FERGUSON, OF BALTIMORE, MARYLAND, ASSIGNOR OF ONE- i HALF TOWILLIAM G. H. STUMP, OF SAME PLACE.

DEVICE FOR OPENING OR CLOSlNG ELEVATOR-DOORS.

SPECIFICATION forming part of Letters Patent No. 527,366, dated October9, 1894.

Application filed June 12, 1894.

To all whom it may concern:

Be it known that 1, WILLIAM J. FERGUSON, a citizen of the United States,residing at Baltimore, in the State of Maryland, have invented certainnew and useful Improvements in Devices for Opening or Closing Elevator-Doors, of which the followingis a specificati'on.

This invention relates to certain new and use'ful improvelrents indevices for opening and closing elevator doors.

The object of the invention is to provide a simple device by means ofwhich the condoctor in an elevator car may cause the doors located atthe var'ous floors to be opened or I closed as desired as the elevatorascends or descerds the elevator shaft.

The invention is illustrated in the acco mpanying; drawings, in which-Figure 1 is a view of an elevator door located on a floor and themechanism connected with the door for ope ring and closing it. Fig. 2 isa side vie v'showing the stationary retractor which is located alongsideof each door, the vertica ent" ess chain, and the trip-arm on the carwhich trave St s the retractor and actuates the said vc lie 1 chain.Fig. 3 is a detail view of the trip-t rm and showing its relativeposition vfth respect to the retractor.

Fig. 4 is a top or plan view of the trip-arm.

The letter A, in the drawings designates one of the ("core 0*. anelevator shaft located at each floor at d which, as usual, slides backand forth on a horinontal track, I), from which it is suspended byhangers, c. The door has at its top an upward projecting arm, d, madefast to a horizontal endlers chain, E, above the door by which the dooris opened and closed as hereinafter described. This horizontal chainpasses over a pulley, F, at one side of the door and also over one step,f, of a cone pulley, F, atthe other side of the door. The cone pulleyhas position above the elevator door and adjacentthe door jamb, e. Apulley, F, has position some distance below the lower end of the doorand in a direct vertical line below the cone pulley, F, and a verticalendless chain, E, connects between the lower pulley, F and the step, f,of the cone pulley. 7

The vertical chain serves to actuate the horiseen No. 514,282. (Nomodel.)

zontal chain and cause it to open and close the door, in the mannerhereinafter described.

The pulleys, F, F, over which the horizon tal chain, E, passes, arerelatively larger than the pulleys, f, F, over which the vertical chain,E, passes. arrangement, a certain movement of the said vertical chainwill result in a much greater movement of the said horizontal chainwhich shifts the door, and this latter movement will produce a momentumsufficient to fully open the door.

The vertical chain, E, carries a downturned hook-lip, h, which engageswith an upturned hook-lip, h, on the elevator door, and the twohook-lips when engaged serve as a catch to hold the door closed. Thevertical chain also carries twoknocker blocks, '5, i, one block on eachstretch of the chain, upon which a trip-arm, H, acts, said trip-armbeing carried by the. car, to move the said vertical chain.

p The vertical retractor, G, is stationary and has two projecting curvedfaces, g, separated from each other by a straight face, g. This bar hasposition forward of and in a vertical line between the two stretches ofthe vertical chain, E. The retractor bar also has a curved face, 9adjoining each of the pulleys, F, W,

which prevents the trip-arm from coming in contact with either of thepulleys when it is projected at that point.

By this construction and The trip-arm, H, has a yoke-end or bifurcatedend provided with a roller, Z, journaled between the two arms, m, m, andsaid two arms project beyond theroller. This triparm is carried on theelevator car, the bottom, I, of which has a bracket, j, depending fromit anda bell-crank lever, j is pivoted to the bracket. To one end ofthis bell-crank lever is attached a foot rod, 70, which projects upthrough the floor of the car, and to the other end of the bell-cranklever the trip-arm is connected. A spiral spring, is, around the Ifoot-rod, 70, tends to keep the rod in a normal raised position and thetrip-arm retracted. The ends of the yoke-arms, m, m, of the triparm,take on each side of the vertical retractor bar, G, sothat the roller,Z, when the arm, H, is retracted will passclose by the outer edge by thevertical chain, whereby a certain movement of the said vertical chainwill result in a greater movement of the horizontal chain; avertically-moving car; and means on the car for actuating said verticalchain, substantially as described.

In testimony whereof I affix my signature in the presence of twowitnesses.

WILLIAM J. FERGUSON. Witnesses:

CHARLES E. MANN, J12, O. CALVERT HINES.

